sequence.nth(index) → object selection.nth(index) → selection<object>
Get the nth element of a sequence, counting from zero. If the argument is negative, count from the last element.
Example: Select the second element in the array.
r.expr(r.array(1,2,3)).nth(1).run(conn);
Example: Select the bronze medalist from the competitors.
r.table("players").orderBy().optArg("index", r.desc("score")).nth(3).run(conn);
Example: Select the last place competitor.
r.table("players").orderBy().optArg("index", r.desc("score")).nth(-1).run(conn);
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https://rethinkdb.com/api/java/nth/